Short answer. Yes. Article 1304 of the Civil Code is explicit: when partial payment has been made and the payer is subrogated to part of the creditor's rights, the original creditor retains priority over the subrogee for the unpaid remainder of the same credit.
What the law says
A creditor, to whom partial payment has been made, may exercise his right for the remainder, and he shall be preferred to the person who has been subrogated in his place in virtue of the partial payment of the same credit.
Civil Code, Article 1304 — A Creditor's Remaining Right After Partial Subrogation. Read the full provision →
What partial subrogation means
Subrogation occurs when a third party pays another person's debt and steps into the creditor's shoes, acquiring the right to collect from the debtor. When the payment is only partial — covering some but not all of what is owed — the third party becomes subrogated only for the amount they paid. The original creditor retains rights over the remaining unpaid balance. Both the creditor and the subrogee now have claims against the same debtor, which raises the question of who ranks first.
The original creditor has priority
Article 1304 answers the ranking question squarely: the original creditor is preferred over the partial subrogee. The creditor may exercise their rights for the unpaid balance, and the creditor's claim on that balance takes precedence over the subrogee's claim for the portion they paid. This means that if the debtor's assets are insufficient to satisfy both, the original creditor collects first, and the subrogee is satisfied only from what remains — or not at all if the assets run out.
The rationale for this priority
The rule protects the original creditor from an unintended consequence of partial payment. Without Article 1304, a third party could pay just a small fraction of a large debt and then compete on equal footing with the creditor for recovery of the rest. That would create an incentive for debtors to arrange for friendly partial payments to dilute the creditor's priority. The law prevents this by keeping the creditor at the front of the line for the remainder of what they were originally owed.
What this means for the debtor
As the debtor in this situation, you now have two separate claimants: the original creditor for the unpaid balance, and the subrogee for the portion they covered on your behalf. The subrogee's claim is subordinate to the creditor's. If you have limited assets and face pressure from both, the creditor's balance must be addressed first. The subrogee who paid part of your debt takes the risk that when they go to collect from you, the original creditor has already been fully satisfied — only then does the subrogee stand to recover anything. Understanding this priority is important when negotiating with both parties.